class_docstr: File-like object that only reads a slice of a file
  
  Inspired by stackoverflow.com/a/29838711/593036
code: def __enter__(self):
      self.f = open(self.filepath, "rb")
      self.f.seek(self.seek_from)
      return self
  
imports: import json
  import os
  import subprocess
  import sys
  import warnings
  from argparse import ArgumentParser
  from contextlib import AbstractContextManager
  from typing import Dict, List, Optional
  import requests
  from ..utils import logging
  from .None import BaseTransformersCLICommand
label_desc: Use image node_id 2 for calling the FileSlice obj's underlying member method code with example usage: obj.__enter__() and returns: self